Actually Thunderbird developers are planning to go full on html+js as well: https://mail.mozilla.org/pipermail/tb-planning/2015-September/004066.html https://m

Actually Thunderbird developers are planning to go full on html+js as well: https://mail.mozilla.org/pipermail/tb-planning/2015-September/004066.html https://mail.mozilla.org/pipermail/tb-planning/2015-Septembe...